Download the questions here
The password to open the file is - teachooisbest
How can we change feeble sound to loud sound?
Answer
Loudness of sound is directly proportional to its amplitude.
Feeble sound can be changed to loud sound by increasing its amplitude.
What is Supersonic Speed
Answer
When speed of an object is more than speed of sound,it is said to be travelling at supersonic speed
Example
Bullets, Jet Aircraft travel at supersonic speed
